Since this morning I am getting the same error message (no reference to null in mine though : "Cannot read property 'SHOW_CONNECTIONS' of undefined".
But I got this all of a sudden, with no apparent reason...

I upgradded a few days ago from 0.8.3 to 0.9.1. I'm running an Ubuntu 12.04 server, with guacamole.war in tomcat7.
Since I upgradded to 0.9.1, I'm experiencing quite some connection difficulties, getting the 15seconds timeout connection error messagebox on the client side.
I tried with either IE7, chrome 35 or firefox 30.

After I got this message once, I have to restart the tomcat server in order to get the home screen back. It still seems to load some the expected web page content, but nothings displays anymore until I restart tomcat...

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IE7 is definitely not supported. The oldest IE having all JavaScript and HTML5 features required is IE10.

As for Chrome and Firefox ... both should be working.

To clarify a few things:

Errors relating to being unable to read "SHOW_CONNECTIONS" are due to the failed loading of guac-ui.js, which is a static file. This specific script is listed within index.xhtml and client.xhtml before any others which depend on it. The only way that the object which has "SHOW_CONNECTIONS" could not exist is if guac-ui.js is not loaded by the browser, and the browser continues to execute the page anyway.

When these static files are loaded, they come directly from Tomcat. There is no part of the Guacamole web application which controls whether individual JavaScript files can load. If the load of a specific static file is failing, something strange is going on.

Can you check your browser's JavaScript or error logs if this happens again? There should be more information describing what is failing and how.

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Thanks for your time ! And sorry for my answering delay ! Actually, restarting my apache solved my problem... I really don't know what happened, but it may have to do with caching issues. My tomcat is behind a reverse proxying apache.

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I too am having issues with IE10. I am running 0.9.1 and redirecting with Apache It works fine with Chrome once you set the proxycookiepath, however IE still does the same error, I noticed in debug of IE it uses a different Javasession value everytime like the cookie path is not set.

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*with 0.9.1on IE11 still the Invalid login !?!on IE10.0.10 in VM and firefox no issue

The problem is that IE10 at work cause the "Unable to get property 'SHOW_CONNECTIONS' of undefined or null reference" issue: do you know if something which can be blocked causes this? Or maybe a firewall/proxy issue?
I will note their IE version next week

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I have not been able to get it to work on IE remotely, the logs show that a user null tried to login. I did some more troubleshooting and see that the cookies for Java do not seem to be handled properly with IE. The java session ID gets changed with IE while it stays the same for Firefox and Chrome. I had this same thing happen (all browsers)when I had reverse cookie path not set correctly. This issues seems to have something to do with Apache redirects.

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